1// SPDX-License-Identifier: GPL-2.0-only
  2/*
  3 * Copyright (C) 2007-2012 Siemens AG
  4 *
  5 * Written by:
  6 * Alexander Smirnov <alex.bluesman.smirnov@gmail.com>
  7 */
  8
  9#include <linux/kernel.h>
 10#include <linux/module.h>
 11#include <linux/netdevice.h>
 12
 13#include <net/netlink.h>
 14#include <net/nl802154.h>
 15#include <net/mac802154.h>
 16#include <net/ieee802154_netdev.h>
 17#include <net/route.h>
 18#include <net/cfg802154.h>
 19
 20#include "ieee802154_i.h"
 21#include "cfg.h"
 22
 23static void ieee802154_tasklet_handler(unsigned long data)
 24{
 25	struct ieee802154_local *local = (struct ieee802154_local *)data;
 26	struct sk_buff *skb;
 27
 28	while ((skb = skb_dequeue(&local->skb_queue))) {
 29		switch (skb->pkt_type) {
 30		case IEEE802154_RX_MSG:
 31			/* Clear skb->pkt_type in order to not confuse kernel
 32			 * netstack.
 33			 */
 34			skb->pkt_type = 0;
 35			ieee802154_rx(local, skb);
 36			break;
 37		default:
 38			WARN(1, "mac802154: Packet is of unknown type %d\n",
 39			     skb->pkt_type);
 40			kfree_skb(skb);
 41			break;
 42		}
 43	}
 44}
 45
 46struct ieee802154_hw *
 47ieee802154_alloc_hw(size_t priv_data_len, const struct ieee802154_ops *ops)
 48{
 49	struct wpan_phy *phy;
 50	struct ieee802154_local *local;
 51	size_t priv_size;
 52
 53	if (WARN_ON(!ops || !(ops->xmit_async || ops->xmit_sync) || !ops->ed ||
 54		    !ops->start || !ops->stop || !ops->set_channel))
 55		return NULL;
 56
 57	/* Ensure 32-byte alignment of our private data and hw private data.
 58	 * We use the wpan_phy priv data for both our ieee802154_local and for
 59	 * the driver's private data
 60	 *
 61	 * in memory it'll be like this:
 62	 *
 63	 * +-------------------------+
 64	 * | struct wpan_phy         |
 65	 * +-------------------------+
 66	 * | struct ieee802154_local |
 67	 * +-------------------------+
 68	 * | driver's private data   |
 69	 * +-------------------------+
 70	 *
 71	 * Due to ieee802154 layer isn't aware of driver and MAC structures,
 72	 * so lets align them here.
 73	 */
 74
 75	priv_size = ALIGN(sizeof(*local), NETDEV_ALIGN) + priv_data_len;
 76
 77	phy = wpan_phy_new(&mac802154_config_ops, priv_size);
 78	if (!phy) {
 79		pr_err("failure to allocate master IEEE802.15.4 device\n");
 80		return NULL;
 81	}
 82
 83	phy->privid = mac802154_wpan_phy_privid;
 84
 85	local = wpan_phy_priv(phy);
 86	local->phy = phy;
 87	local->hw.phy = local->phy;
 88	local->hw.priv = (char *)local + ALIGN(sizeof(*local), NETDEV_ALIGN);
 89	local->ops = ops;
 90
 91	INIT_LIST_HEAD(&local->interfaces);
 92	mutex_init(&local->iflist_mtx);
 93
 94	tasklet_init(&local->tasklet,
 95		     ieee802154_tasklet_handler,
 96		     (unsigned long)local);
 97
 98	skb_queue_head_init(&local->skb_queue);
 99
100	INIT_WORK(&local->tx_work, ieee802154_xmit_worker);
101
102	/* init supported flags with 802.15.4 default ranges */
103	phy->supported.max_minbe = 8;
104	phy->supported.min_maxbe = 3;
105	phy->supported.max_maxbe = 8;
106	phy->supported.min_frame_retries = 0;
107	phy->supported.max_frame_retries = 7;
108	phy->supported.max_csma_backoffs = 5;
109	phy->supported.lbt = NL802154_SUPPORTED_BOOL_FALSE;
110
111	/* always supported */
112	phy->supported.iftypes = BIT(NL802154_IFTYPE_NODE);
113
114	return &local->hw;
115}
116EXPORT_SYMBOL(ieee802154_alloc_hw);
117
118void ieee802154_free_hw(struct ieee802154_hw *hw)
119{
120	struct ieee802154_local *local = hw_to_local(hw);
121
122	BUG_ON(!list_empty(&local->interfaces));
123
124	mutex_destroy(&local->iflist_mtx);
125
126	wpan_phy_free(local->phy);
127}
128EXPORT_SYMBOL(ieee802154_free_hw);
129
130static void ieee802154_setup_wpan_phy_pib(struct wpan_phy *wpan_phy)
131{
132	/* TODO warn on empty symbol_duration
133	 * Should be done when all drivers sets this value.
134	 */
135
136	wpan_phy->lifs_period = IEEE802154_LIFS_PERIOD *
137				wpan_phy->symbol_duration;
138	wpan_phy->sifs_period = IEEE802154_SIFS_PERIOD *
139				wpan_phy->symbol_duration;
140}
141
142int ieee802154_register_hw(struct ieee802154_hw *hw)
143{
144	struct ieee802154_local *local = hw_to_local(hw);
145	struct net_device *dev;
146	int rc = -ENOSYS;
147
148	local->workqueue =
149		create_singlethread_workqueue(wpan_phy_name(local->phy));
150	if (!local->workqueue) {
151		rc = -ENOMEM;
152		goto out;
153	}
154
155	hrtimer_init(&local->ifs_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
156	local->ifs_timer.function = ieee802154_xmit_ifs_timer;
157
158	wpan_phy_set_dev(local->phy, local->hw.parent);
159
160	ieee802154_setup_wpan_phy_pib(local->phy);
161
162	if (!(hw->flags & IEEE802154_HW_CSMA_PARAMS)) {
163		local->phy->supported.min_csma_backoffs = 4;
164		local->phy->supported.max_csma_backoffs = 4;
165		local->phy->supported.min_maxbe = 5;
166		local->phy->supported.max_maxbe = 5;
167		local->phy->supported.min_minbe = 3;
168		local->phy->supported.max_minbe = 3;
169	}
170
171	if (!(hw->flags & IEEE802154_HW_FRAME_RETRIES)) {
172		local->phy->supported.min_frame_retries = 3;
173		local->phy->supported.max_frame_retries = 3;
174	}
175
176	if (hw->flags & IEEE802154_HW_PROMISCUOUS)
177		local->phy->supported.iftypes |= BIT(NL802154_IFTYPE_MONITOR);
178
179	rc = wpan_phy_register(local->phy);
180	if (rc < 0)
181		goto out_wq;
182
183	rtnl_lock();
184
185	dev = ieee802154_if_add(local, "wpan%d", NET_NAME_ENUM,
186				NL802154_IFTYPE_NODE,
187				cpu_to_le64(0x0000000000000000ULL));
188	if (IS_ERR(dev)) {
189		rtnl_unlock();
190		rc = PTR_ERR(dev);
191		goto out_phy;
192	}
193
194	rtnl_unlock();
195
196	return 0;
197
198out_phy:
199	wpan_phy_unregister(local->phy);
200out_wq:
201	destroy_workqueue(local->workqueue);
202out:
203	return rc;
204}
205EXPORT_SYMBOL(ieee802154_register_hw);
206
207void ieee802154_unregister_hw(struct ieee802154_hw *hw)
208{
209	struct ieee802154_local *local = hw_to_local(hw);
210
211	tasklet_kill(&local->tasklet);
212	flush_workqueue(local->workqueue);
213
214	rtnl_lock();
215
216	ieee802154_remove_interfaces(local);
217
218	rtnl_unlock();
219
220	destroy_workqueue(local->workqueue);
221	wpan_phy_unregister(local->phy);
222}
223EXPORT_SYMBOL(ieee802154_unregister_hw);
224
225static int __init ieee802154_init(void)
226{
227	return ieee802154_iface_init();
228}
229
230static void __exit ieee802154_exit(void)
231{
232	ieee802154_iface_exit();
233
234	rcu_barrier();
235}
236
237subsys_initcall(ieee802154_init);
238module_exit(ieee802154_exit);
239
240MODULE_DESCRIPTION("IEEE 802.15.4 subsystem");
241MODULE_LICENSE("GPL v2");